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Valve failure and treatment of a common, valve leakage: Reason: 1. Body blisters or cracks 2. Body crack repair welding repair: 1. Polished cracks suspected Department, with 4% nitric acid solution etching, if cracks can be displayed 2. Crack at the digging treatment. Second, the stem and nut thread with its damaged or broken stem, stem bending: Reason: 1. Improper operation, the switch force is too large, limit device failure, over torque protection is not moving. 2. Thread with too loose or too tight 3. Too many operations, the service life is too long to deal with: 1. Improve the operation, not too much force; check the limit device, check the torque protection device 2. Choose the right material, assembly tolerances meet the requirements 3. Replacement spare parts Third, the valve cover leakage with the surface: the reason: 1. Insufficient or tight bolt bias 2. Gasket does not meet the requirements or gasket damage 3. Combination of surface defects: 1. Tighten the bolts or make sure the clearance of the cover flange 2. Change the gasket 3. Disintegration study cover sealing surface